ADDITIVE FOR LEAD-ACID BATTERY AND LEAD-ACID BATTERY

摘要

An additive for lead-acid battery including sulfonated polyacrylic acid aimed at extending the battery life by preventing the sulfation of the negative electrode, and a lead-acid battery using the additive.

主权项

1. An additive for lead-acid batteries wherein the said additive is a polymer or copolymer including at least one kind of structural unit expressed by the following chemical formulas 1 through 6, and a carboxyl group and sulfo group originated in chemical formulas 1 through 6 is included in the said polymer or copolymer.(In the formula, M indicates hydrogen atom, alkali metal atom or ammonium group.)(In the formula, M indicates hydrogen atom, alkali metal atom or ammonium group.)(In the formula, M and M* indicates hydrogen atom, alkali metal atom or ammonium group.)(In the formula, M and M* indicates hydrogen atom, alkali metal atom or ammonium group.)(In the formula, M and M* indicates hydrogen atom, alkali metal atom or ammonium group.)(In the formula, M and M* indicates hydrogen atom, alkali metal atom or ammonium group.)